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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 15,020 $ 45,017
Adjustments to reconcile net income to net cash provided by operating activities:    
Loss on disposal of assets 129,887 231
Depreciation 125,240 60,897
Amortization of intangibles 25,510 7,694
Foreign currency transaction loss 590  
Deferred income taxes, net of acquisitions (26,528) 17,473
Amortization of debt issuance costs 1,013 670
Share-based compensation 12,989 5,299
Interest income on restricted assets (137) (129)
Interest accretion 3,424 1,465
Excess tax benefit associated with equity-based compensation   (4,434)
Adjustments to contingent consideration 11,313 (75)
Payment of contingent consideration recorded in earnings   (33)
Net change in operating assets and liabilities, net of acquisitions (10,844) 30,641
Net cash provided by operating activities 287,477 164,716
Cash flows from investing activities:    
Payments for acquisitions, net of cash acquired (344,265) (3,555)
Capital expenditures for property and equipment (91,205) (56,575)
Proceeds from disposal of assets 18,815 681
Change in restricted assets, net of interest income 4,446 260
Other (650) 147
Net cash used in investing activities (412,859) (59,042)
Cash flows from financing activities:    
Proceeds from long-term debt 436,086 115,000
Principal payments on notes payable and long-term debt (170,374) (197,024)
Payment of contingent consideration recorded at acquisition date (5,290) (2,217)
Change in book overdraft 20,047 (151)
Proceeds from option and warrant exercises 1,946  
Excess tax benefit associated with equity-based compensation   4,434
Payments for cash dividends (31,707) (17,791)
Tax withholdings related to net share settlements of restricted stock units (13,030) (9,632)
Distributions to noncontrolling interests   (4)
Debt issuance costs (633)  
Proceeds from sale of common shares held in trust 2,369  
Net cash provided by (used in) financing activities 239,414 (107,385)
Effect of exchange rate changes on cash and equivalents 82  
Net increase (decrease) in cash and equivalents 114,114 (1,711)
Cash and equivalents at beginning of period 154,382 10,974
Less: change in cash held for sale (27)  
Cash and equivalents at end of period 268,469 9,263
Non-cash financing activity:    
Liabilities assumed and notes payable issued to sellers of businesses acquired 146,537 $ 766
Non-cash consideration received for asset sales $ 8,132